BJ Penn shocked the world time and time again in his martial arts career.

The man they call “The Prodigy” was the first American to win the Brazilian jiu-jitsu world championships at the black belt level. Later, he became one of only two fighters to win UFC titles in two weight divisions.

So, in a way, it wasn’t surprising to get another shock from the Hilo, Hawaii native last night.

In an appearance on UFC Tonight, Penn — who retired last year after a loss to Frankie Edgar — announced he’s ready to return to the cage.

His targeted opponent? A fighter linked to Mike Dolce, the nutritionist that he worked with for that Edgar fight.

“You know what, I’m sick and tired of hearing about Mike Dolce,” Penn said, as transcribed by “You know what Mike Dolce, I’ll put a challenge out right now. You go grab Nik Lentz, that’s your boy, bring him down to 145, I’ll run through him in one round, then I’ll find you in the back and I’ll smash you! Okay, let’s do that, let’s do that right now, I’m ready.”

“He was there to work for 20 days,” Penn said of Dolce. “I paid him $1,000 a day and you know, I’m not here to talk about it again but I’m just sick and tired of hearing it.”

He’s tired enough to call out Lentz — but does he have the strength to fight like the Penn of old? Only time will tell.

Video of Penn’s appearance: